Originally Posted by HoTBoX111
This is definitely what i didn't want to hear. I guess it's better i find out sooner than later. Thanks for all your help Bill, time to save up for internals i guess.
I wouldn't jump to that conclusion just yet. If the "grinding" noise you heard was internal engine damage, you likely wouldn't have made it home and the noise would have got worse and worse.
It could be something loose in the engine bay that the knock sensor is picking up. You might want to try putting the car in neutral with the parking brake on and then rev the motor via the throttle connection at the throttle body with the hood open and see if you hear anything.